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1/*
2 * Syscall interface to knfsd.
3 *
4 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
5 */
6
7#include <linux/slab.h>
8#include <linux/namei.h>
9#include <linux/ctype.h>
10
11#include <linux/sunrpc/svcsock.h>
12#include <linux/lockd/lockd.h>
13#include <linux/sunrpc/addr.h>
14#include <linux/sunrpc/gss_api.h>
15#include <linux/sunrpc/gss_krb5_enctypes.h>
16#include <linux/sunrpc/rpc_pipe_fs.h>
17#include <linux/module.h>
18
19#include "idmap.h"
20#include "nfsd.h"
21#include "cache.h"
22#include "state.h"
23#include "netns.h"
24
25/*
26 * We have a single directory with several nodes in it.
27 */
28enum {
29 NFSD_Root = 1,
30 NFSD_List,
31 NFSD_Export_features,
32 NFSD_Fh,
33 NFSD_FO_UnlockIP,
34 NFSD_FO_UnlockFS,
35 NFSD_Threads,
36 NFSD_Pool_Threads,
37 NFSD_Pool_Stats,
38 NFSD_Reply_Cache_Stats,
39 NFSD_Versions,
40 NFSD_Ports,
41 NFSD_MaxBlkSize,
42 NFSD_SupportedEnctypes,
43 /*
44 * The below MUST come last. Otherwise we leave a hole in nfsd_files[]
45 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
46 */
47#ifdef CONFIG_NFSD_V4
48 NFSD_Leasetime,
49 NFSD_Gracetime,
50 NFSD_RecoveryDir,
51#endif
52};
53
54/*
55 * write() for these nodes.
56 */
57static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
58static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
59static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
60static ssize_t write_threads(struct file *file, char *buf, size_t size);
61static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
62static ssize_t write_versions(struct file *file, char *buf, size_t size);
63static ssize_t write_ports(struct file *file, char *buf, size_t size);
64static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
65#ifdef CONFIG_NFSD_V4
66static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
67static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
68static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
69#endif
70
71static ssize_t (*write_op[])(struct file *, char *, size_t) = {
72 [NFSD_Fh] = write_filehandle,
73 [NFSD_FO_UnlockIP] = write_unlock_ip,
74 [NFSD_FO_UnlockFS] = write_unlock_fs,
75 [NFSD_Threads] = write_threads,
76 [NFSD_Pool_Threads] = write_pool_threads,
77 [NFSD_Versions] = write_versions,
78 [NFSD_Ports] = write_ports,
79 [NFSD_MaxBlkSize] = write_maxblksize,
80#ifdef CONFIG_NFSD_V4
81 [NFSD_Leasetime] = write_leasetime,
82 [NFSD_Gracetime] = write_gracetime,
83 [NFSD_RecoveryDir] = write_recoverydir,
84#endif
85};
86
87static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
88{
89 ino_t ino = file_inode(file)->i_ino;
90 char *data;
91 ssize_t rv;
92
93 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
94 return -EINVAL;
95
96 data = simple_transaction_get(file, buf, size);
97 if (IS_ERR(data))
98 return PTR_ERR(data);
99
100 rv = write_op[ino](file, data, size);
101 if (rv >= 0) {
102 simple_transaction_set(file, rv);
103 rv = size;
104 }
105 return rv;
106}
107
108static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
109{
110 if (! file->private_data) {
111 /* An attempt to read a transaction file without writing
112 * causes a 0-byte write so that the file can return
113 * state information
114 */
115 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
116 if (rv < 0)
117 return rv;
118 }
119 return simple_transaction_read(file, buf, size, pos);
120}
121
122static const struct file_operations transaction_ops = {
123 .write = nfsctl_transaction_write,
124 .read = nfsctl_transaction_read,
125 .release = simple_transaction_release,
126 .llseek = default_llseek,
127};
128
129static int exports_net_open(struct net *net, struct file *file)
130{
131 int err;
132 struct seq_file *seq;
133 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
134
135 err = seq_open(file, &nfs_exports_op);
136 if (err)
137 return err;
138
139 seq = file->private_data;
140 seq->private = nn->svc_export_cache;
141 return 0;
142}
143
144static int exports_proc_open(struct inode *inode, struct file *file)
145{
146 return exports_net_open(current->nsproxy->net_ns, file);
147}
148
149static const struct file_operations exports_proc_operations = {
150 .open = exports_proc_open,
151 .read = seq_read,
152 .llseek = seq_lseek,
153 .release = seq_release,
154 .owner = THIS_MODULE,
155};
156
157static int exports_nfsd_open(struct inode *inode, struct file *file)
158{
159 return exports_net_open(inode->i_sb->s_fs_info, file);
160}
161
162static const struct file_operations exports_nfsd_operations = {
163 .open = exports_nfsd_open,
164 .read = seq_read,
165 .llseek = seq_lseek,
166 .release = seq_release,
167 .owner = THIS_MODULE,
168};
169
170static int export_features_show(struct seq_file *m, void *v)
171{
172 seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
173 return 0;
174}
175
176static int export_features_open(struct inode *inode, struct file *file)
177{
178 return single_open(file, export_features_show, NULL);
179}
180
181static const struct file_operations export_features_operations = {
182 .open = export_features_open,
183 .read = seq_read,
184 .llseek = seq_lseek,
185 .release = single_release,
186};
187
188#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
189static int supported_enctypes_show(struct seq_file *m, void *v)
190{
191 seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
192 return 0;
193}
194
195static int supported_enctypes_open(struct inode *inode, struct file *file)
196{
197 return single_open(file, supported_enctypes_show, NULL);
198}
199
200static const struct file_operations supported_enctypes_ops = {
201 .open = supported_enctypes_open,
202 .read = seq_read,
203 .llseek = seq_lseek,
204 .release = single_release,
205};
206#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
207
208static const struct file_operations pool_stats_operations = {
209 .open = nfsd_pool_stats_open,
210 .read = seq_read,
211 .llseek = seq_lseek,
212 .release = nfsd_pool_stats_release,
213 .owner = THIS_MODULE,
214};
215
216static struct file_operations reply_cache_stats_operations = {
217 .open = nfsd_reply_cache_stats_open,
218 .read = seq_read,
219 .llseek = seq_lseek,
220 .release = single_release,
221};
222
223/*----------------------------------------------------------------------------*/
224/*
225 * payload - write methods
226 */
227
228
229/**
230 * write_unlock_ip - Release all locks used by a client
231 *
232 * Experimental.
233 *
234 * Input:
235 * buf: '\n'-terminated C string containing a
236 * presentation format IP address
237 * size: length of C string in @buf
238 * Output:
239 * On success: returns zero if all specified locks were released;
240 * returns one if one or more locks were not released
241 * On error: return code is negative errno value
242 */
243static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
244{
245 struct sockaddr_storage address;
246 struct sockaddr *sap = (struct sockaddr *)&address;
247 size_t salen = sizeof(address);
248 char *fo_path;
249 struct net *net = file->f_dentry->d_sb->s_fs_info;
250
251 /* sanity check */
252 if (size == 0)
253 return -EINVAL;
254
255 if (buf[size-1] != '\n')
256 return -EINVAL;
257
258 fo_path = buf;
259 if (qword_get(&buf, fo_path, size) < 0)
260 return -EINVAL;
261
262 if (rpc_pton(net, fo_path, size, sap, salen) == 0)
263 return -EINVAL;
264
265 return nlmsvc_unlock_all_by_ip(sap);
266}
267
268/**
269 * write_unlock_fs - Release all locks on a local file system
270 *
271 * Experimental.
272 *
273 * Input:
274 * buf: '\n'-terminated C string containing the
275 * absolute pathname of a local file system
276 * size: length of C string in @buf
277 * Output:
278 * On success: returns zero if all specified locks were released;
279 * returns one if one or more locks were not released
280 * On error: return code is negative errno value
281 */
282static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
283{
284 struct path path;
285 char *fo_path;
286 int error;
287
288 /* sanity check */
289 if (size == 0)
290 return -EINVAL;
291
292 if (buf[size-1] != '\n')
293 return -EINVAL;
294
295 fo_path = buf;
296 if (qword_get(&buf, fo_path, size) < 0)
297 return -EINVAL;
298
299 error = kern_path(fo_path, 0, &path);
300 if (error)
301 return error;
302
303 /*
304 * XXX: Needs better sanity checking. Otherwise we could end up
305 * releasing locks on the wrong file system.
306 *
307 * For example:
308 * 1. Does the path refer to a directory?
309 * 2. Is that directory a mount point, or
310 * 3. Is that directory the root of an exported file system?
311 */
312 error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
313
314 path_put(&path);
315 return error;
316}
317
318/**
319 * write_filehandle - Get a variable-length NFS file handle by path
320 *
321 * On input, the buffer contains a '\n'-terminated C string comprised of
322 * three alphanumeric words separated by whitespace. The string may
323 * contain escape sequences.
324 *
325 * Input:
326 * buf:
327 * domain: client domain name
328 * path: export pathname
329 * maxsize: numeric maximum size of
330 * @buf
331 * size: length of C string in @buf
332 * Output:
333 * On success: passed-in buffer filled with '\n'-terminated C
334 * string containing a ASCII hex text version
335 * of the NFS file handle;
336 * return code is the size in bytes of the string
337 * On error: return code is negative errno value
338 */
339static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
340{
341 char *dname, *path;
342 int uninitialized_var(maxsize);
343 char *mesg = buf;
344 int len;
345 struct auth_domain *dom;
346 struct knfsd_fh fh;
347 struct net *net = file->f_dentry->d_sb->s_fs_info;
348
349 if (size == 0)
350 return -EINVAL;
351
352 if (buf[size-1] != '\n')
353 return -EINVAL;
354 buf[size-1] = 0;
355
356 dname = mesg;
357 len = qword_get(&mesg, dname, size);
358 if (len <= 0)
359 return -EINVAL;
360
361 path = dname+len+1;
362 len = qword_get(&mesg, path, size);
363 if (len <= 0)
364 return -EINVAL;
365
366 len = get_int(&mesg, &maxsize);
367 if (len)
368 return len;
369
370 if (maxsize < NFS_FHSIZE)
371 return -EINVAL;
372 if (maxsize > NFS3_FHSIZE)
373 maxsize = NFS3_FHSIZE;
374
375 if (qword_get(&mesg, mesg, size)>0)
376 return -EINVAL;
377
378 /* we have all the words, they are in buf.. */
379 dom = unix_domain_find(dname);
380 if (!dom)
381 return -ENOMEM;
382
383 len = exp_rootfh(net, dom, path, &fh, maxsize);
384 auth_domain_put(dom);
385 if (len)
386 return len;
387
388 mesg = buf;
389 len = SIMPLE_TRANSACTION_LIMIT;
390 qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
391 mesg[-1] = '\n';
392 return mesg - buf;
393}
394
395/**
396 * write_threads - Start NFSD, or report the current number of running threads
397 *
398 * Input:
399 * buf: ignored
400 * size: zero
401 * Output:
402 * On success: passed-in buffer filled with '\n'-terminated C
403 * string numeric value representing the number of
404 * running NFSD threads;
405 * return code is the size in bytes of the string
406 * On error: return code is zero
407 *
408 * OR
409 *
410 * Input:
411 * buf: C string containing an unsigned
412 * integer value representing the
413 * number of NFSD threads to start
414 * size: non-zero length of C string in @buf
415 * Output:
416 * On success: NFS service is started;
417 * passed-in buffer filled with '\n'-terminated C
418 * string numeric value representing the number of
419 * running NFSD threads;
420 * return code is the size in bytes of the string
421 * On error: return code is zero or a negative errno value
422 */
423static ssize_t write_threads(struct file *file, char *buf, size_t size)
424{
425 char *mesg = buf;
426 int rv;
427 struct net *net = file->f_dentry->d_sb->s_fs_info;
428
429 if (size > 0) {
430 int newthreads;
431 rv = get_int(&mesg, &newthreads);
432 if (rv)
433 return rv;
434 if (newthreads < 0)
435 return -EINVAL;
436 rv = nfsd_svc(newthreads, net);
437 if (rv < 0)
438 return rv;
439 } else
440 rv = nfsd_nrthreads(net);
441
442 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
443}
444
445/**
446 * write_pool_threads - Set or report the current number of threads per pool
447 *
448 * Input:
449 * buf: ignored
450 * size: zero
451 *
452 * OR
453 *
454 * Input:
455 * buf: C string containing whitespace-
456 * separated unsigned integer values
457 * representing the number of NFSD
458 * threads to start in each pool
459 * size: non-zero length of C string in @buf
460 * Output:
461 * On success: passed-in buffer filled with '\n'-terminated C
462 * string containing integer values representing the
463 * number of NFSD threads in each pool;
464 * return code is the size in bytes of the string
465 * On error: return code is zero or a negative errno value
466 */
467static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
468{
469 /* if size > 0, look for an array of number of threads per node
470 * and apply them then write out number of threads per node as reply
471 */
472 char *mesg = buf;
473 int i;
474 int rv;
475 int len;
476 int npools;
477 int *nthreads;
478 struct net *net = file->f_dentry->d_sb->s_fs_info;
479
480 mutex_lock(&nfsd_mutex);
481 npools = nfsd_nrpools(net);
482 if (npools == 0) {
483 /*
484 * NFS is shut down. The admin can start it by
485 * writing to the threads file but NOT the pool_threads
486 * file, sorry. Report zero threads.
487 */
488 mutex_unlock(&nfsd_mutex);
489 strcpy(buf, "0\n");
490 return strlen(buf);
491 }
492
493 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
494 rv = -ENOMEM;
495 if (nthreads == NULL)
496 goto out_free;
497
498 if (size > 0) {
499 for (i = 0; i < npools; i++) {
500 rv = get_int(&mesg, &nthreads[i]);
501 if (rv == -ENOENT)
502 break; /* fewer numbers than pools */
503 if (rv)
504 goto out_free; /* syntax error */
505 rv = -EINVAL;
506 if (nthreads[i] < 0)
507 goto out_free;
508 }
509 rv = nfsd_set_nrthreads(i, nthreads, net);
510 if (rv)
511 goto out_free;
512 }
513
514 rv = nfsd_get_nrthreads(npools, nthreads, net);
515 if (rv)
516 goto out_free;
517
518 mesg = buf;
519 size = SIMPLE_TRANSACTION_LIMIT;
520 for (i = 0; i < npools && size > 0; i++) {
521 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
522 len = strlen(mesg);
523 size -= len;
524 mesg += len;
525 }
526 rv = mesg - buf;
527out_free:
528 kfree(nthreads);
529 mutex_unlock(&nfsd_mutex);
530 return rv;
531}
532
533static ssize_t __write_versions(struct file *file, char *buf, size_t size)
534{
535 char *mesg = buf;
536 char *vers, *minorp, sign;
537 int len, num, remaining;
538 unsigned minor;
539 ssize_t tlen = 0;
540 char *sep;
541 struct net *net = file->f_dentry->d_sb->s_fs_info;
542 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
543
544 if (size>0) {
545 if (nn->nfsd_serv)
546 /* Cannot change versions without updating
547 * nn->nfsd_serv->sv_xdrsize, and reallocing
548 * rq_argp and rq_resp
549 */
550 return -EBUSY;
551 if (buf[size-1] != '\n')
552 return -EINVAL;
553 buf[size-1] = 0;
554
555 vers = mesg;
556 len = qword_get(&mesg, vers, size);
557 if (len <= 0) return -EINVAL;
558 do {
559 sign = *vers;
560 if (sign == '+' || sign == '-')
561 num = simple_strtol((vers+1), &minorp, 0);
562 else
563 num = simple_strtol(vers, &minorp, 0);
564 if (*minorp == '.') {
565 if (num != 4)
566 return -EINVAL;
567 minor = simple_strtoul(minorp+1, NULL, 0);
568 if (minor == 0)
569 return -EINVAL;
570 if (nfsd_minorversion(minor, sign == '-' ?
571 NFSD_CLEAR : NFSD_SET) < 0)
572 return -EINVAL;
573 goto next;
574 }
575 switch(num) {
576 case 2:
577 case 3:
578 case 4:
579 nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
580 break;
581 default:
582 return -EINVAL;
583 }
584 next:
585 vers += len + 1;
586 } while ((len = qword_get(&mesg, vers, size)) > 0);
587 /* If all get turned off, turn them back on, as
588 * having no versions is BAD
589 */
590 nfsd_reset_versions();
591 }
592
593 /* Now write current state into reply buffer */
594 len = 0;
595 sep = "";
596 remaining = SIMPLE_TRANSACTION_LIMIT;
597 for (num=2 ; num <= 4 ; num++)
598 if (nfsd_vers(num, NFSD_AVAIL)) {
599 len = snprintf(buf, remaining, "%s%c%d", sep,
600 nfsd_vers(num, NFSD_TEST)?'+':'-',
601 num);
602 sep = " ";
603
604 if (len > remaining)
605 break;
606 remaining -= len;
607 buf += len;
608 tlen += len;
609 }
610 if (nfsd_vers(4, NFSD_AVAIL))
611 for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION;
612 minor++) {
613 len = snprintf(buf, remaining, " %c4.%u",
614 (nfsd_vers(4, NFSD_TEST) &&
615 nfsd_minorversion(minor, NFSD_TEST)) ?
616 '+' : '-',
617 minor);
618
619 if (len > remaining)
620 break;
621 remaining -= len;
622 buf += len;
623 tlen += len;
624 }
625
626 len = snprintf(buf, remaining, "\n");
627 if (len > remaining)
628 return -EINVAL;
629 return tlen + len;
630}
631
632/**
633 * write_versions - Set or report the available NFS protocol versions
634 *
635 * Input:
636 * buf: ignored
637 * size: zero
638 * Output:
639 * On success: passed-in buffer filled with '\n'-terminated C
640 * string containing positive or negative integer
641 * values representing the current status of each
642 * protocol version;
643 * return code is the size in bytes of the string
644 * On error: return code is zero or a negative errno value
645 *
646 * OR
647 *
648 * Input:
649 * buf: C string containing whitespace-
650 * separated positive or negative
651 * integer values representing NFS
652 * protocol versions to enable ("+n")
653 * or disable ("-n")
654 * size: non-zero length of C string in @buf
655 * Output:
656 * On success: status of zero or more protocol versions has
657 * been updated; passed-in buffer filled with
658 * '\n'-terminated C string containing positive
659 * or negative integer values representing the
660 * current status of each protocol version;
661 * return code is the size in bytes of the string
662 * On error: return code is zero or a negative errno value
663 */
664static ssize_t write_versions(struct file *file, char *buf, size_t size)
665{
666 ssize_t rv;
667
668 mutex_lock(&nfsd_mutex);
669 rv = __write_versions(file, buf, size);
670 mutex_unlock(&nfsd_mutex);
671 return rv;
672}
673
674/*
675 * Zero-length write. Return a list of NFSD's current listener
676 * transports.
677 */
678static ssize_t __write_ports_names(char *buf, struct net *net)
679{
680 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
681
682 if (nn->nfsd_serv == NULL)
683 return 0;
684 return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
685}
686
687/*
688 * A single 'fd' number was written, in which case it must be for
689 * a socket of a supported family/protocol, and we use it as an
690 * nfsd listener.
691 */
692static ssize_t __write_ports_addfd(char *buf, struct net *net)
693{
694 char *mesg = buf;
695 int fd, err;
696 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
697
698 err = get_int(&mesg, &fd);
699 if (err != 0 || fd < 0)
700 return -EINVAL;
701
702 if (svc_alien_sock(net, fd)) {
703 printk(KERN_ERR "%s: socket net is different to NFSd's one\n", __func__);
704 return -EINVAL;
705 }
706
707 err = nfsd_create_serv(net);
708 if (err != 0)
709 return err;
710
711 err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
712 if (err < 0) {
713 nfsd_destroy(net);
714 return err;
715 }
716
717 /* Decrease the count, but don't shut down the service */
718 nn->nfsd_serv->sv_nrthreads--;
719 return err;
720}
721
722/*
723 * A transport listener is added by writing it's transport name and
724 * a port number.
725 */
726static ssize_t __write_ports_addxprt(char *buf, struct net *net)
727{
728 char transport[16];
729 struct svc_xprt *xprt;
730 int port, err;
731 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
732
733 if (sscanf(buf, "%15s %5u", transport, &port) != 2)
734 return -EINVAL;
735
736 if (port < 1 || port > USHRT_MAX)
737 return -EINVAL;
738
739 err = nfsd_create_serv(net);
740 if (err != 0)
741 return err;
742
743 err = svc_create_xprt(nn->nfsd_serv, transport, net,
744 PF_INET, port, SVC_SOCK_ANONYMOUS);
745 if (err < 0)
746 goto out_err;
747
748 err = svc_create_xprt(nn->nfsd_serv, transport, net,
749 PF_INET6, port, SVC_SOCK_ANONYMOUS);
750 if (err < 0 && err != -EAFNOSUPPORT)
751 goto out_close;
752
753 /* Decrease the count, but don't shut down the service */
754 nn->nfsd_serv->sv_nrthreads--;
755 return 0;
756out_close:
757 xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port);
758 if (xprt != NULL) {
759 svc_close_xprt(xprt);
760 svc_xprt_put(xprt);
761 }
762out_err:
763 nfsd_destroy(net);
764 return err;
765}
766
767static ssize_t __write_ports(struct file *file, char *buf, size_t size,
768 struct net *net)
769{
770 if (size == 0)
771 return __write_ports_names(buf, net);
772
773 if (isdigit(buf[0]))
774 return __write_ports_addfd(buf, net);
775
776 if (isalpha(buf[0]))
777 return __write_ports_addxprt(buf, net);
778
779 return -EINVAL;
780}
781
782/**
783 * write_ports - Pass a socket file descriptor or transport name to listen on
784 *
785 * Input:
786 * buf: ignored
787 * size: zero
788 * Output:
789 * On success: passed-in buffer filled with a '\n'-terminated C
790 * string containing a whitespace-separated list of
791 * named NFSD listeners;
792 * return code is the size in bytes of the string
793 * On error: return code is zero or a negative errno value
794 *
795 * OR
796 *
797 * Input:
798 * buf: C string containing an unsigned
799 * integer value representing a bound
800 * but unconnected socket that is to be
801 * used as an NFSD listener; listen(3)
802 * must be called for a SOCK_STREAM
803 * socket, otherwise it is ignored
804 * size: non-zero length of C string in @buf
805 * Output:
806 * On success: NFS service is started;
807 * passed-in buffer filled with a '\n'-terminated C
808 * string containing a unique alphanumeric name of
809 * the listener;
810 * return code is the size in bytes of the string
811 * On error: return code is a negative errno value
812 *
813 * OR
814 *
815 * Input:
816 * buf: C string containing a transport
817 * name and an unsigned integer value
818 * representing the port to listen on,
819 * separated by whitespace
820 * size: non-zero length of C string in @buf
821 * Output:
822 * On success: returns zero; NFS service is started
823 * On error: return code is a negative errno value
824 */
825static ssize_t write_ports(struct file *file, char *buf, size_t size)
826{
827 ssize_t rv;
828 struct net *net = file->f_dentry->d_sb->s_fs_info;
829
830 mutex_lock(&nfsd_mutex);
831 rv = __write_ports(file, buf, size, net);
832 mutex_unlock(&nfsd_mutex);
833 return rv;
834}
835
836
837int nfsd_max_blksize;
838
839/**
840 * write_maxblksize - Set or report the current NFS blksize
841 *
842 * Input:
843 * buf: ignored
844 * size: zero
845 *
846 * OR
847 *
848 * Input:
849 * buf: C string containing an unsigned
850 * integer value representing the new
851 * NFS blksize
852 * size: non-zero length of C string in @buf
853 * Output:
854 * On success: passed-in buffer filled with '\n'-terminated C string
855 * containing numeric value of the current NFS blksize
856 * setting;
857 * return code is the size in bytes of the string
858 * On error: return code is zero or a negative errno value
859 */
860static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
861{
862 char *mesg = buf;
863 struct net *net = file->f_dentry->d_sb->s_fs_info;
864 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
865
866 if (size > 0) {
867 int bsize;
868 int rv = get_int(&mesg, &bsize);
869 if (rv)
870 return rv;
871 /* force bsize into allowed range and
872 * required alignment.
873 */
874 if (bsize < 1024)
875 bsize = 1024;
876 if (bsize > NFSSVC_MAXBLKSIZE)
877 bsize = NFSSVC_MAXBLKSIZE;
878 bsize &= ~(1024-1);
879 mutex_lock(&nfsd_mutex);
880 if (nn->nfsd_serv) {
881 mutex_unlock(&nfsd_mutex);
882 return -EBUSY;
883 }
884 nfsd_max_blksize = bsize;
885 mutex_unlock(&nfsd_mutex);
886 }
887
888 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
889 nfsd_max_blksize);
890}
891
892#ifdef CONFIG_NFSD_V4
893static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
894 time_t *time, struct nfsd_net *nn)
895{
896 char *mesg = buf;
897 int rv, i;
898
899 if (size > 0) {
900 if (nn->nfsd_serv)
901 return -EBUSY;
902 rv = get_int(&mesg, &i);
903 if (rv)
904 return rv;
905 /*
906 * Some sanity checking. We don't have a reason for
907 * these particular numbers, but problems with the
908 * extremes are:
909 * - Too short: the briefest network outage may
910 * cause clients to lose all their locks. Also,
911 * the frequent polling may be wasteful.
912 * - Too long: do you really want reboot recovery
913 * to take more than an hour? Or to make other
914 * clients wait an hour before being able to
915 * revoke a dead client's locks?
916 */
917 if (i < 10 || i > 3600)
918 return -EINVAL;
919 *time = i;
920 }
921
922 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
923}
924
925static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
926 time_t *time, struct nfsd_net *nn)
927{
928 ssize_t rv;
929
930 mutex_lock(&nfsd_mutex);
931 rv = __nfsd4_write_time(file, buf, size, time, nn);
932 mutex_unlock(&nfsd_mutex);
933 return rv;
934}
935
936/**
937 * write_leasetime - Set or report the current NFSv4 lease time
938 *
939 * Input:
940 * buf: ignored
941 * size: zero
942 *
943 * OR
944 *
945 * Input:
946 * buf: C string containing an unsigned
947 * integer value representing the new
948 * NFSv4 lease expiry time
949 * size: non-zero length of C string in @buf
950 * Output:
951 * On success: passed-in buffer filled with '\n'-terminated C
952 * string containing unsigned integer value of the
953 * current lease expiry time;
954 * return code is the size in bytes of the string
955 * On error: return code is zero or a negative errno value
956 */
957static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
958{
959 struct net *net = file->f_dentry->d_sb->s_fs_info;
960 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
961 return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
962}
963
964/**
965 * write_gracetime - Set or report current NFSv4 grace period time
966 *
967 * As above, but sets the time of the NFSv4 grace period.
968 *
969 * Note this should never be set to less than the *previous*
970 * lease-period time, but we don't try to enforce this. (In the common
971 * case (a new boot), we don't know what the previous lease time was
972 * anyway.)
973 */
974static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
975{
976 struct net *net = file->f_dentry->d_sb->s_fs_info;
977 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
978 return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
979}
980
981static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
982 struct nfsd_net *nn)
983{
984 char *mesg = buf;
985 char *recdir;
986 int len, status;
987
988 if (size > 0) {
989 if (nn->nfsd_serv)
990 return -EBUSY;
991 if (size > PATH_MAX || buf[size-1] != '\n')
992 return -EINVAL;
993 buf[size-1] = 0;
994
995 recdir = mesg;
996 len = qword_get(&mesg, recdir, size);
997 if (len <= 0)
998 return -EINVAL;
999
1000 status = nfs4_reset_recoverydir(recdir);
1001 if (status)
1002 return status;
1003 }
1004
1005 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1006 nfs4_recoverydir());
1007}
1008
1009/**
1010 * write_recoverydir - Set or report the pathname of the recovery directory
1011 *
1012 * Input:
1013 * buf: ignored
1014 * size: zero
1015 *
1016 * OR
1017 *
1018 * Input:
1019 * buf: C string containing the pathname
1020 * of the directory on a local file
1021 * system containing permanent NFSv4
1022 * recovery data
1023 * size: non-zero length of C string in @buf
1024 * Output:
1025 * On success: passed-in buffer filled with '\n'-terminated C string
1026 * containing the current recovery pathname setting;
1027 * return code is the size in bytes of the string
1028 * On error: return code is zero or a negative errno value
1029 */
1030static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1031{
1032 ssize_t rv;
1033 struct net *net = file->f_dentry->d_sb->s_fs_info;
1034 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1035
1036 mutex_lock(&nfsd_mutex);
1037 rv = __write_recoverydir(file, buf, size, nn);
1038 mutex_unlock(&nfsd_mutex);
1039 return rv;
1040}
1041
1042#endif
1043
1044/*----------------------------------------------------------------------------*/
1045/*
1046 * populating the filesystem.
1047 */
1048
1049static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
1050{
1051 static struct tree_descr nfsd_files[] = {
1052 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1053 [NFSD_Export_features] = {"export_features",
1054 &export_features_operations, S_IRUGO},
1055 [NFSD_FO_UnlockIP] = {"unlock_ip",
1056 &transaction_ops, S_IWUSR|S_IRUSR},
1057 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1058 &transaction_ops, S_IWUSR|S_IRUSR},
1059 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1060 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1061 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1062 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1063 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", &reply_cache_stats_operations, S_IRUGO},
1064 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1065 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1066 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1067#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1068 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1069#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1070#ifdef CONFIG_NFSD_V4
1071 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1072 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1073 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1074#endif
1075 /* last one */ {""}
1076 };
1077 struct net *net = data;
1078 int ret;
1079
1080 ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
1081 if (ret)
1082 return ret;
1083 sb->s_fs_info = get_net(net);
1084 return 0;
1085}
1086
1087static struct dentry *nfsd_mount(struct file_system_type *fs_type,
1088 int flags, const char *dev_name, void *data)
1089{
1090 return mount_ns(fs_type, flags, current->nsproxy->net_ns, nfsd_fill_super);
1091}
1092
1093static void nfsd_umount(struct super_block *sb)
1094{
1095 struct net *net = sb->s_fs_info;
1096
1097 kill_litter_super(sb);
1098 put_net(net);
1099}
1100
1101static struct file_system_type nfsd_fs_type = {
1102 .owner = THIS_MODULE,
1103 .name = "nfsd",
1104 .mount = nfsd_mount,
1105 .kill_sb = nfsd_umount,
1106};
1107MODULE_ALIAS_FS("nfsd");
1108
1109#ifdef CONFIG_PROC_FS
1110static int create_proc_exports_entry(void)
1111{
1112 struct proc_dir_entry *entry;
1113
1114 entry = proc_mkdir("fs/nfs", NULL);
1115 if (!entry)
1116 return -ENOMEM;
1117 entry = proc_create("exports", 0, entry,
1118 &exports_proc_operations);
1119 if (!entry) {
1120 remove_proc_entry("fs/nfs", NULL);
1121 return -ENOMEM;
1122 }
1123 return 0;
1124}
1125#else /* CONFIG_PROC_FS */
1126static int create_proc_exports_entry(void)
1127{
1128 return 0;
1129}
1130#endif
1131
1132int nfsd_net_id;
1133
1134static __net_init int nfsd_init_net(struct net *net)
1135{
1136 int retval;
1137 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1138
1139 retval = nfsd_export_init(net);
1140 if (retval)
1141 goto out_export_error;
1142 retval = nfsd_idmap_init(net);
1143 if (retval)
1144 goto out_idmap_error;
1145 nn->nfsd4_lease = 90; /* default lease time */
1146 nn->nfsd4_grace = 90;
1147 return 0;
1148
1149out_idmap_error:
1150 nfsd_export_shutdown(net);
1151out_export_error:
1152 return retval;
1153}
1154
1155static __net_exit void nfsd_exit_net(struct net *net)
1156{
1157 nfsd_idmap_shutdown(net);
1158 nfsd_export_shutdown(net);
1159}
1160
1161static struct pernet_operations nfsd_net_ops = {
1162 .init = nfsd_init_net,
1163 .exit = nfsd_exit_net,
1164 .id = &nfsd_net_id,
1165 .size = sizeof(struct nfsd_net),
1166};
1167
1168static int __init init_nfsd(void)
1169{
1170 int retval;
1171 printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1172
1173 retval = register_cld_notifier();
1174 if (retval)
1175 return retval;
1176 retval = register_pernet_subsys(&nfsd_net_ops);
1177 if (retval < 0)
1178 goto out_unregister_notifier;
1179 retval = nfsd4_init_slabs();
1180 if (retval)
1181 goto out_unregister_pernet;
1182 nfs4_state_init();
1183 retval = nfsd_fault_inject_init(); /* nfsd fault injection controls */
1184 if (retval)
1185 goto out_free_slabs;
1186 nfsd_stat_init(); /* Statistics */
1187 retval = nfsd_reply_cache_init();
1188 if (retval)
1189 goto out_free_stat;
1190 nfsd_lockd_init(); /* lockd->nfsd callbacks */
1191 retval = create_proc_exports_entry();
1192 if (retval)
1193 goto out_free_lockd;
1194 retval = register_filesystem(&nfsd_fs_type);
1195 if (retval)
1196 goto out_free_all;
1197 return 0;
1198out_free_all:
1199 remove_proc_entry("fs/nfs/exports", NULL);
1200 remove_proc_entry("fs/nfs", NULL);
1201out_free_lockd:
1202 nfsd_lockd_shutdown();
1203 nfsd_reply_cache_shutdown();
1204out_free_stat:
1205 nfsd_stat_shutdown();
1206 nfsd_fault_inject_cleanup();
1207out_free_slabs:
1208 nfsd4_free_slabs();
1209out_unregister_pernet:
1210 unregister_pernet_subsys(&nfsd_net_ops);
1211out_unregister_notifier:
1212 unregister_cld_notifier();
1213 return retval;
1214}
1215
1216static void __exit exit_nfsd(void)
1217{
1218 nfsd_reply_cache_shutdown();
1219 remove_proc_entry("fs/nfs/exports", NULL);
1220 remove_proc_entry("fs/nfs", NULL);
1221 nfsd_stat_shutdown();
1222 nfsd_lockd_shutdown();
1223 nfsd4_free_slabs();
1224 nfsd_fault_inject_cleanup();
1225 unregister_filesystem(&nfsd_fs_type);
1226 unregister_pernet_subsys(&nfsd_net_ops);
1227 unregister_cld_notifier();
1228}
1229
1230MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1231MODULE_LICENSE("GPL");
1232module_init(init_nfsd)
1233module_exit(exit_nfsd)
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Syscall interface to knfsd.
4 *
5 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
6 */
7
8#include <linux/slab.h>
9#include <linux/namei.h>
10#include <linux/ctype.h>
11#include <linux/fs_context.h>
12
13#include <linux/sunrpc/svcsock.h>
14#include <linux/lockd/lockd.h>
15#include <linux/sunrpc/addr.h>
16#include <linux/sunrpc/gss_api.h>
17#include <linux/sunrpc/gss_krb5_enctypes.h>
18#include <linux/sunrpc/rpc_pipe_fs.h>
19#include <linux/module.h>
20#include <linux/fsnotify.h>
21
22#include "idmap.h"
23#include "nfsd.h"
24#include "cache.h"
25#include "state.h"
26#include "netns.h"
27#include "pnfs.h"
28
29/*
30 * We have a single directory with several nodes in it.
31 */
32enum {
33 NFSD_Root = 1,
34 NFSD_List,
35 NFSD_Export_features,
36 NFSD_Fh,
37 NFSD_FO_UnlockIP,
38 NFSD_FO_UnlockFS,
39 NFSD_Threads,
40 NFSD_Pool_Threads,
41 NFSD_Pool_Stats,
42 NFSD_Reply_Cache_Stats,
43 NFSD_Versions,
44 NFSD_Ports,
45 NFSD_MaxBlkSize,
46 NFSD_MaxConnections,
47 NFSD_SupportedEnctypes,
48 /*
49 * The below MUST come last. Otherwise we leave a hole in nfsd_files[]
50 * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
51 */
52#ifdef CONFIG_NFSD_V4
53 NFSD_Leasetime,
54 NFSD_Gracetime,
55 NFSD_RecoveryDir,
56 NFSD_V4EndGrace,
57#endif
58 NFSD_MaxReserved
59};
60
61/*
62 * write() for these nodes.
63 */
64static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
65static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
66static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
67static ssize_t write_threads(struct file *file, char *buf, size_t size);
68static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
69static ssize_t write_versions(struct file *file, char *buf, size_t size);
70static ssize_t write_ports(struct file *file, char *buf, size_t size);
71static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
72static ssize_t write_maxconn(struct file *file, char *buf, size_t size);
73#ifdef CONFIG_NFSD_V4
74static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
75static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
76static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
77static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size);
78#endif
79
80static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
81 [NFSD_Fh] = write_filehandle,
82 [NFSD_FO_UnlockIP] = write_unlock_ip,
83 [NFSD_FO_UnlockFS] = write_unlock_fs,
84 [NFSD_Threads] = write_threads,
85 [NFSD_Pool_Threads] = write_pool_threads,
86 [NFSD_Versions] = write_versions,
87 [NFSD_Ports] = write_ports,
88 [NFSD_MaxBlkSize] = write_maxblksize,
89 [NFSD_MaxConnections] = write_maxconn,
90#ifdef CONFIG_NFSD_V4
91 [NFSD_Leasetime] = write_leasetime,
92 [NFSD_Gracetime] = write_gracetime,
93 [NFSD_RecoveryDir] = write_recoverydir,
94 [NFSD_V4EndGrace] = write_v4_end_grace,
95#endif
96};
97
98static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
99{
100 ino_t ino = file_inode(file)->i_ino;
101 char *data;
102 ssize_t rv;
103
104 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
105 return -EINVAL;
106
107 data = simple_transaction_get(file, buf, size);
108 if (IS_ERR(data))
109 return PTR_ERR(data);
110
111 rv = write_op[ino](file, data, size);
112 if (rv >= 0) {
113 simple_transaction_set(file, rv);
114 rv = size;
115 }
116 return rv;
117}
118
119static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
120{
121 if (! file->private_data) {
122 /* An attempt to read a transaction file without writing
123 * causes a 0-byte write so that the file can return
124 * state information
125 */
126 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
127 if (rv < 0)
128 return rv;
129 }
130 return simple_transaction_read(file, buf, size, pos);
131}
132
133static const struct file_operations transaction_ops = {
134 .write = nfsctl_transaction_write,
135 .read = nfsctl_transaction_read,
136 .release = simple_transaction_release,
137 .llseek = default_llseek,
138};
139
140static int exports_net_open(struct net *net, struct file *file)
141{
142 int err;
143 struct seq_file *seq;
144 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
145
146 err = seq_open(file, &nfs_exports_op);
147 if (err)
148 return err;
149
150 seq = file->private_data;
151 seq->private = nn->svc_export_cache;
152 return 0;
153}
154
155static int exports_proc_open(struct inode *inode, struct file *file)
156{
157 return exports_net_open(current->nsproxy->net_ns, file);
158}
159
160static const struct proc_ops exports_proc_ops = {
161 .proc_open = exports_proc_open,
162 .proc_read = seq_read,
163 .proc_lseek = seq_lseek,
164 .proc_release = seq_release,
165};
166
167static int exports_nfsd_open(struct inode *inode, struct file *file)
168{
169 return exports_net_open(inode->i_sb->s_fs_info, file);
170}
171
172static const struct file_operations exports_nfsd_operations = {
173 .open = exports_nfsd_open,
174 .read = seq_read,
175 .llseek = seq_lseek,
176 .release = seq_release,
177};
178
179static int export_features_show(struct seq_file *m, void *v)
180{
181 seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
182 return 0;
183}
184
185static int export_features_open(struct inode *inode, struct file *file)
186{
187 return single_open(file, export_features_show, NULL);
188}
189
190static const struct file_operations export_features_operations = {
191 .open = export_features_open,
192 .read = seq_read,
193 .llseek = seq_lseek,
194 .release = single_release,
195};
196
197#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
198static int supported_enctypes_show(struct seq_file *m, void *v)
199{
200 seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
201 return 0;
202}
203
204static int supported_enctypes_open(struct inode *inode, struct file *file)
205{
206 return single_open(file, supported_enctypes_show, NULL);
207}
208
209static const struct file_operations supported_enctypes_ops = {
210 .open = supported_enctypes_open,
211 .read = seq_read,
212 .llseek = seq_lseek,
213 .release = single_release,
214};
215#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
216
217static const struct file_operations pool_stats_operations = {
218 .open = nfsd_pool_stats_open,
219 .read = seq_read,
220 .llseek = seq_lseek,
221 .release = nfsd_pool_stats_release,
222};
223
224static const struct file_operations reply_cache_stats_operations = {
225 .open = nfsd_reply_cache_stats_open,
226 .read = seq_read,
227 .llseek = seq_lseek,
228 .release = single_release,
229};
230
231/*----------------------------------------------------------------------------*/
232/*
233 * payload - write methods
234 */
235
236static inline struct net *netns(struct file *file)
237{
238 return file_inode(file)->i_sb->s_fs_info;
239}
240
241/*
242 * write_unlock_ip - Release all locks used by a client
243 *
244 * Experimental.
245 *
246 * Input:
247 * buf: '\n'-terminated C string containing a
248 * presentation format IP address
249 * size: length of C string in @buf
250 * Output:
251 * On success: returns zero if all specified locks were released;
252 * returns one if one or more locks were not released
253 * On error: return code is negative errno value
254 */
255static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
256{
257 struct sockaddr_storage address;
258 struct sockaddr *sap = (struct sockaddr *)&address;
259 size_t salen = sizeof(address);
260 char *fo_path;
261 struct net *net = netns(file);
262
263 /* sanity check */
264 if (size == 0)
265 return -EINVAL;
266
267 if (buf[size-1] != '\n')
268 return -EINVAL;
269
270 fo_path = buf;
271 if (qword_get(&buf, fo_path, size) < 0)
272 return -EINVAL;
273
274 if (rpc_pton(net, fo_path, size, sap, salen) == 0)
275 return -EINVAL;
276
277 return nlmsvc_unlock_all_by_ip(sap);
278}
279
280/*
281 * write_unlock_fs - Release all locks on a local file system
282 *
283 * Experimental.
284 *
285 * Input:
286 * buf: '\n'-terminated C string containing the
287 * absolute pathname of a local file system
288 * size: length of C string in @buf
289 * Output:
290 * On success: returns zero if all specified locks were released;
291 * returns one if one or more locks were not released
292 * On error: return code is negative errno value
293 */
294static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
295{
296 struct path path;
297 char *fo_path;
298 int error;
299
300 /* sanity check */
301 if (size == 0)
302 return -EINVAL;
303
304 if (buf[size-1] != '\n')
305 return -EINVAL;
306
307 fo_path = buf;
308 if (qword_get(&buf, fo_path, size) < 0)
309 return -EINVAL;
310
311 error = kern_path(fo_path, 0, &path);
312 if (error)
313 return error;
314
315 /*
316 * XXX: Needs better sanity checking. Otherwise we could end up
317 * releasing locks on the wrong file system.
318 *
319 * For example:
320 * 1. Does the path refer to a directory?
321 * 2. Is that directory a mount point, or
322 * 3. Is that directory the root of an exported file system?
323 */
324 error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
325
326 path_put(&path);
327 return error;
328}
329
330/*
331 * write_filehandle - Get a variable-length NFS file handle by path
332 *
333 * On input, the buffer contains a '\n'-terminated C string comprised of
334 * three alphanumeric words separated by whitespace. The string may
335 * contain escape sequences.
336 *
337 * Input:
338 * buf:
339 * domain: client domain name
340 * path: export pathname
341 * maxsize: numeric maximum size of
342 * @buf
343 * size: length of C string in @buf
344 * Output:
345 * On success: passed-in buffer filled with '\n'-terminated C
346 * string containing a ASCII hex text version
347 * of the NFS file handle;
348 * return code is the size in bytes of the string
349 * On error: return code is negative errno value
350 */
351static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
352{
353 char *dname, *path;
354 int maxsize;
355 char *mesg = buf;
356 int len;
357 struct auth_domain *dom;
358 struct knfsd_fh fh;
359
360 if (size == 0)
361 return -EINVAL;
362
363 if (buf[size-1] != '\n')
364 return -EINVAL;
365 buf[size-1] = 0;
366
367 dname = mesg;
368 len = qword_get(&mesg, dname, size);
369 if (len <= 0)
370 return -EINVAL;
371
372 path = dname+len+1;
373 len = qword_get(&mesg, path, size);
374 if (len <= 0)
375 return -EINVAL;
376
377 len = get_int(&mesg, &maxsize);
378 if (len)
379 return len;
380
381 if (maxsize < NFS_FHSIZE)
382 return -EINVAL;
383 maxsize = min(maxsize, NFS3_FHSIZE);
384
385 if (qword_get(&mesg, mesg, size)>0)
386 return -EINVAL;
387
388 /* we have all the words, they are in buf.. */
389 dom = unix_domain_find(dname);
390 if (!dom)
391 return -ENOMEM;
392
393 len = exp_rootfh(netns(file), dom, path, &fh, maxsize);
394 auth_domain_put(dom);
395 if (len)
396 return len;
397
398 mesg = buf;
399 len = SIMPLE_TRANSACTION_LIMIT;
400 qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
401 mesg[-1] = '\n';
402 return mesg - buf;
403}
404
405/*
406 * write_threads - Start NFSD, or report the current number of running threads
407 *
408 * Input:
409 * buf: ignored
410 * size: zero
411 * Output:
412 * On success: passed-in buffer filled with '\n'-terminated C
413 * string numeric value representing the number of
414 * running NFSD threads;
415 * return code is the size in bytes of the string
416 * On error: return code is zero
417 *
418 * OR
419 *
420 * Input:
421 * buf: C string containing an unsigned
422 * integer value representing the
423 * number of NFSD threads to start
424 * size: non-zero length of C string in @buf
425 * Output:
426 * On success: NFS service is started;
427 * passed-in buffer filled with '\n'-terminated C
428 * string numeric value representing the number of
429 * running NFSD threads;
430 * return code is the size in bytes of the string
431 * On error: return code is zero or a negative errno value
432 */
433static ssize_t write_threads(struct file *file, char *buf, size_t size)
434{
435 char *mesg = buf;
436 int rv;
437 struct net *net = netns(file);
438
439 if (size > 0) {
440 int newthreads;
441 rv = get_int(&mesg, &newthreads);
442 if (rv)
443 return rv;
444 if (newthreads < 0)
445 return -EINVAL;
446 rv = nfsd_svc(newthreads, net, file->f_cred);
447 if (rv < 0)
448 return rv;
449 } else
450 rv = nfsd_nrthreads(net);
451
452 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
453}
454
455/*
456 * write_pool_threads - Set or report the current number of threads per pool
457 *
458 * Input:
459 * buf: ignored
460 * size: zero
461 *
462 * OR
463 *
464 * Input:
465 * buf: C string containing whitespace-
466 * separated unsigned integer values
467 * representing the number of NFSD
468 * threads to start in each pool
469 * size: non-zero length of C string in @buf
470 * Output:
471 * On success: passed-in buffer filled with '\n'-terminated C
472 * string containing integer values representing the
473 * number of NFSD threads in each pool;
474 * return code is the size in bytes of the string
475 * On error: return code is zero or a negative errno value
476 */
477static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
478{
479 /* if size > 0, look for an array of number of threads per node
480 * and apply them then write out number of threads per node as reply
481 */
482 char *mesg = buf;
483 int i;
484 int rv;
485 int len;
486 int npools;
487 int *nthreads;
488 struct net *net = netns(file);
489
490 mutex_lock(&nfsd_mutex);
491 npools = nfsd_nrpools(net);
492 if (npools == 0) {
493 /*
494 * NFS is shut down. The admin can start it by
495 * writing to the threads file but NOT the pool_threads
496 * file, sorry. Report zero threads.
497 */
498 mutex_unlock(&nfsd_mutex);
499 strcpy(buf, "0\n");
500 return strlen(buf);
501 }
502
503 nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
504 rv = -ENOMEM;
505 if (nthreads == NULL)
506 goto out_free;
507
508 if (size > 0) {
509 for (i = 0; i < npools; i++) {
510 rv = get_int(&mesg, &nthreads[i]);
511 if (rv == -ENOENT)
512 break; /* fewer numbers than pools */
513 if (rv)
514 goto out_free; /* syntax error */
515 rv = -EINVAL;
516 if (nthreads[i] < 0)
517 goto out_free;
518 }
519 rv = nfsd_set_nrthreads(i, nthreads, net);
520 if (rv)
521 goto out_free;
522 }
523
524 rv = nfsd_get_nrthreads(npools, nthreads, net);
525 if (rv)
526 goto out_free;
527
528 mesg = buf;
529 size = SIMPLE_TRANSACTION_LIMIT;
530 for (i = 0; i < npools && size > 0; i++) {
531 snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
532 len = strlen(mesg);
533 size -= len;
534 mesg += len;
535 }
536 rv = mesg - buf;
537out_free:
538 kfree(nthreads);
539 mutex_unlock(&nfsd_mutex);
540 return rv;
541}
542
543static ssize_t
544nfsd_print_version_support(struct nfsd_net *nn, char *buf, int remaining,
545 const char *sep, unsigned vers, int minor)
546{
547 const char *format = minor < 0 ? "%s%c%u" : "%s%c%u.%u";
548 bool supported = !!nfsd_vers(nn, vers, NFSD_TEST);
549
550 if (vers == 4 && minor >= 0 &&
551 !nfsd_minorversion(nn, minor, NFSD_TEST))
552 supported = false;
553 if (minor == 0 && supported)
554 /*
555 * special case for backward compatability.
556 * +4.0 is never reported, it is implied by
557 * +4, unless -4.0 is present.
558 */
559 return 0;
560 return snprintf(buf, remaining, format, sep,
561 supported ? '+' : '-', vers, minor);
562}
563
564static ssize_t __write_versions(struct file *file, char *buf, size_t size)
565{
566 char *mesg = buf;
567 char *vers, *minorp, sign;
568 int len, num, remaining;
569 ssize_t tlen = 0;
570 char *sep;
571 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
572
573 if (size>0) {
574 if (nn->nfsd_serv)
575 /* Cannot change versions without updating
576 * nn->nfsd_serv->sv_xdrsize, and reallocing
577 * rq_argp and rq_resp
578 */
579 return -EBUSY;
580 if (buf[size-1] != '\n')
581 return -EINVAL;
582 buf[size-1] = 0;
583
584 vers = mesg;
585 len = qword_get(&mesg, vers, size);
586 if (len <= 0) return -EINVAL;
587 do {
588 enum vers_op cmd;
589 unsigned minor;
590 sign = *vers;
591 if (sign == '+' || sign == '-')
592 num = simple_strtol((vers+1), &minorp, 0);
593 else
594 num = simple_strtol(vers, &minorp, 0);
595 if (*minorp == '.') {
596 if (num != 4)
597 return -EINVAL;
598 if (kstrtouint(minorp+1, 0, &minor) < 0)
599 return -EINVAL;
600 }
601
602 cmd = sign == '-' ? NFSD_CLEAR : NFSD_SET;
603 switch(num) {
604 case 2:
605 case 3:
606 nfsd_vers(nn, num, cmd);
607 break;
608 case 4:
609 if (*minorp == '.') {
610 if (nfsd_minorversion(nn, minor, cmd) < 0)
611 return -EINVAL;
612 } else if ((cmd == NFSD_SET) != nfsd_vers(nn, num, NFSD_TEST)) {
613 /*
614 * Either we have +4 and no minors are enabled,
615 * or we have -4 and at least one minor is enabled.
616 * In either case, propagate 'cmd' to all minors.
617 */
618 minor = 0;
619 while (nfsd_minorversion(nn, minor, cmd) >= 0)
620 minor++;
621 }
622 break;
623 default:
624 return -EINVAL;
625 }
626 vers += len + 1;
627 } while ((len = qword_get(&mesg, vers, size)) > 0);
628 /* If all get turned off, turn them back on, as
629 * having no versions is BAD
630 */
631 nfsd_reset_versions(nn);
632 }
633
634 /* Now write current state into reply buffer */
635 len = 0;
636 sep = "";
637 remaining = SIMPLE_TRANSACTION_LIMIT;
638 for (num=2 ; num <= 4 ; num++) {
639 int minor;
640 if (!nfsd_vers(nn, num, NFSD_AVAIL))
641 continue;
642
643 minor = -1;
644 do {
645 len = nfsd_print_version_support(nn, buf, remaining,
646 sep, num, minor);
647 if (len >= remaining)
648 goto out;
649 remaining -= len;
650 buf += len;
651 tlen += len;
652 minor++;
653 if (len)
654 sep = " ";
655 } while (num == 4 && minor <= NFSD_SUPPORTED_MINOR_VERSION);
656 }
657out:
658 len = snprintf(buf, remaining, "\n");
659 if (len >= remaining)
660 return -EINVAL;
661 return tlen + len;
662}
663
664/*
665 * write_versions - Set or report the available NFS protocol versions
666 *
667 * Input:
668 * buf: ignored
669 * size: zero
670 * Output:
671 * On success: passed-in buffer filled with '\n'-terminated C
672 * string containing positive or negative integer
673 * values representing the current status of each
674 * protocol version;
675 * return code is the size in bytes of the string
676 * On error: return code is zero or a negative errno value
677 *
678 * OR
679 *
680 * Input:
681 * buf: C string containing whitespace-
682 * separated positive or negative
683 * integer values representing NFS
684 * protocol versions to enable ("+n")
685 * or disable ("-n")
686 * size: non-zero length of C string in @buf
687 * Output:
688 * On success: status of zero or more protocol versions has
689 * been updated; passed-in buffer filled with
690 * '\n'-terminated C string containing positive
691 * or negative integer values representing the
692 * current status of each protocol version;
693 * return code is the size in bytes of the string
694 * On error: return code is zero or a negative errno value
695 */
696static ssize_t write_versions(struct file *file, char *buf, size_t size)
697{
698 ssize_t rv;
699
700 mutex_lock(&nfsd_mutex);
701 rv = __write_versions(file, buf, size);
702 mutex_unlock(&nfsd_mutex);
703 return rv;
704}
705
706/*
707 * Zero-length write. Return a list of NFSD's current listener
708 * transports.
709 */
710static ssize_t __write_ports_names(char *buf, struct net *net)
711{
712 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
713
714 if (nn->nfsd_serv == NULL)
715 return 0;
716 return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
717}
718
719/*
720 * A single 'fd' number was written, in which case it must be for
721 * a socket of a supported family/protocol, and we use it as an
722 * nfsd listener.
723 */
724static ssize_t __write_ports_addfd(char *buf, struct net *net, const struct cred *cred)
725{
726 char *mesg = buf;
727 int fd, err;
728 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
729
730 err = get_int(&mesg, &fd);
731 if (err != 0 || fd < 0)
732 return -EINVAL;
733
734 if (svc_alien_sock(net, fd)) {
735 printk(KERN_ERR "%s: socket net is different to NFSd's one\n", __func__);
736 return -EINVAL;
737 }
738
739 err = nfsd_create_serv(net);
740 if (err != 0)
741 return err;
742
743 err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT, cred);
744 if (err < 0) {
745 nfsd_destroy(net);
746 return err;
747 }
748
749 /* Decrease the count, but don't shut down the service */
750 nn->nfsd_serv->sv_nrthreads--;
751 return err;
752}
753
754/*
755 * A transport listener is added by writing it's transport name and
756 * a port number.
757 */
758static ssize_t __write_ports_addxprt(char *buf, struct net *net, const struct cred *cred)
759{
760 char transport[16];
761 struct svc_xprt *xprt;
762 int port, err;
763 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
764
765 if (sscanf(buf, "%15s %5u", transport, &port) != 2)
766 return -EINVAL;
767
768 if (port < 1 || port > USHRT_MAX)
769 return -EINVAL;
770
771 err = nfsd_create_serv(net);
772 if (err != 0)
773 return err;
774
775 err = svc_create_xprt(nn->nfsd_serv, transport, net,
776 PF_INET, port, SVC_SOCK_ANONYMOUS, cred);
777 if (err < 0)
778 goto out_err;
779
780 err = svc_create_xprt(nn->nfsd_serv, transport, net,
781 PF_INET6, port, SVC_SOCK_ANONYMOUS, cred);
782 if (err < 0 && err != -EAFNOSUPPORT)
783 goto out_close;
784
785 /* Decrease the count, but don't shut down the service */
786 nn->nfsd_serv->sv_nrthreads--;
787 return 0;
788out_close:
789 xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port);
790 if (xprt != NULL) {
791 svc_close_xprt(xprt);
792 svc_xprt_put(xprt);
793 }
794out_err:
795 nfsd_destroy(net);
796 return err;
797}
798
799static ssize_t __write_ports(struct file *file, char *buf, size_t size,
800 struct net *net)
801{
802 if (size == 0)
803 return __write_ports_names(buf, net);
804
805 if (isdigit(buf[0]))
806 return __write_ports_addfd(buf, net, file->f_cred);
807
808 if (isalpha(buf[0]))
809 return __write_ports_addxprt(buf, net, file->f_cred);
810
811 return -EINVAL;
812}
813
814/*
815 * write_ports - Pass a socket file descriptor or transport name to listen on
816 *
817 * Input:
818 * buf: ignored
819 * size: zero
820 * Output:
821 * On success: passed-in buffer filled with a '\n'-terminated C
822 * string containing a whitespace-separated list of
823 * named NFSD listeners;
824 * return code is the size in bytes of the string
825 * On error: return code is zero or a negative errno value
826 *
827 * OR
828 *
829 * Input:
830 * buf: C string containing an unsigned
831 * integer value representing a bound
832 * but unconnected socket that is to be
833 * used as an NFSD listener; listen(3)
834 * must be called for a SOCK_STREAM
835 * socket, otherwise it is ignored
836 * size: non-zero length of C string in @buf
837 * Output:
838 * On success: NFS service is started;
839 * passed-in buffer filled with a '\n'-terminated C
840 * string containing a unique alphanumeric name of
841 * the listener;
842 * return code is the size in bytes of the string
843 * On error: return code is a negative errno value
844 *
845 * OR
846 *
847 * Input:
848 * buf: C string containing a transport
849 * name and an unsigned integer value
850 * representing the port to listen on,
851 * separated by whitespace
852 * size: non-zero length of C string in @buf
853 * Output:
854 * On success: returns zero; NFS service is started
855 * On error: return code is a negative errno value
856 */
857static ssize_t write_ports(struct file *file, char *buf, size_t size)
858{
859 ssize_t rv;
860
861 mutex_lock(&nfsd_mutex);
862 rv = __write_ports(file, buf, size, netns(file));
863 mutex_unlock(&nfsd_mutex);
864 return rv;
865}
866
867
868int nfsd_max_blksize;
869
870/*
871 * write_maxblksize - Set or report the current NFS blksize
872 *
873 * Input:
874 * buf: ignored
875 * size: zero
876 *
877 * OR
878 *
879 * Input:
880 * buf: C string containing an unsigned
881 * integer value representing the new
882 * NFS blksize
883 * size: non-zero length of C string in @buf
884 * Output:
885 * On success: passed-in buffer filled with '\n'-terminated C string
886 * containing numeric value of the current NFS blksize
887 * setting;
888 * return code is the size in bytes of the string
889 * On error: return code is zero or a negative errno value
890 */
891static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
892{
893 char *mesg = buf;
894 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
895
896 if (size > 0) {
897 int bsize;
898 int rv = get_int(&mesg, &bsize);
899 if (rv)
900 return rv;
901 /* force bsize into allowed range and
902 * required alignment.
903 */
904 bsize = max_t(int, bsize, 1024);
905 bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE);
906 bsize &= ~(1024-1);
907 mutex_lock(&nfsd_mutex);
908 if (nn->nfsd_serv) {
909 mutex_unlock(&nfsd_mutex);
910 return -EBUSY;
911 }
912 nfsd_max_blksize = bsize;
913 mutex_unlock(&nfsd_mutex);
914 }
915
916 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
917 nfsd_max_blksize);
918}
919
920/*
921 * write_maxconn - Set or report the current max number of connections
922 *
923 * Input:
924 * buf: ignored
925 * size: zero
926 * OR
927 *
928 * Input:
929 * buf: C string containing an unsigned
930 * integer value representing the new
931 * number of max connections
932 * size: non-zero length of C string in @buf
933 * Output:
934 * On success: passed-in buffer filled with '\n'-terminated C string
935 * containing numeric value of max_connections setting
936 * for this net namespace;
937 * return code is the size in bytes of the string
938 * On error: return code is zero or a negative errno value
939 */
940static ssize_t write_maxconn(struct file *file, char *buf, size_t size)
941{
942 char *mesg = buf;
943 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
944 unsigned int maxconn = nn->max_connections;
945
946 if (size > 0) {
947 int rv = get_uint(&mesg, &maxconn);
948
949 if (rv)
950 return rv;
951 nn->max_connections = maxconn;
952 }
953
954 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn);
955}
956
957#ifdef CONFIG_NFSD_V4
958static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
959 time64_t *time, struct nfsd_net *nn)
960{
961 char *mesg = buf;
962 int rv, i;
963
964 if (size > 0) {
965 if (nn->nfsd_serv)
966 return -EBUSY;
967 rv = get_int(&mesg, &i);
968 if (rv)
969 return rv;
970 /*
971 * Some sanity checking. We don't have a reason for
972 * these particular numbers, but problems with the
973 * extremes are:
974 * - Too short: the briefest network outage may
975 * cause clients to lose all their locks. Also,
976 * the frequent polling may be wasteful.
977 * - Too long: do you really want reboot recovery
978 * to take more than an hour? Or to make other
979 * clients wait an hour before being able to
980 * revoke a dead client's locks?
981 */
982 if (i < 10 || i > 3600)
983 return -EINVAL;
984 *time = i;
985 }
986
987 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%lld\n", *time);
988}
989
990static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
991 time64_t *time, struct nfsd_net *nn)
992{
993 ssize_t rv;
994
995 mutex_lock(&nfsd_mutex);
996 rv = __nfsd4_write_time(file, buf, size, time, nn);
997 mutex_unlock(&nfsd_mutex);
998 return rv;
999}
1000
1001/*
1002 * write_leasetime - Set or report the current NFSv4 lease time
1003 *
1004 * Input:
1005 * buf: ignored
1006 * size: zero
1007 *
1008 * OR
1009 *
1010 * Input:
1011 * buf: C string containing an unsigned
1012 * integer value representing the new
1013 * NFSv4 lease expiry time
1014 * size: non-zero length of C string in @buf
1015 * Output:
1016 * On success: passed-in buffer filled with '\n'-terminated C
1017 * string containing unsigned integer value of the
1018 * current lease expiry time;
1019 * return code is the size in bytes of the string
1020 * On error: return code is zero or a negative errno value
1021 */
1022static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
1023{
1024 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1025 return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
1026}
1027
1028/*
1029 * write_gracetime - Set or report current NFSv4 grace period time
1030 *
1031 * As above, but sets the time of the NFSv4 grace period.
1032 *
1033 * Note this should never be set to less than the *previous*
1034 * lease-period time, but we don't try to enforce this. (In the common
1035 * case (a new boot), we don't know what the previous lease time was
1036 * anyway.)
1037 */
1038static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
1039{
1040 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1041 return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
1042}
1043
1044static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
1045 struct nfsd_net *nn)
1046{
1047 char *mesg = buf;
1048 char *recdir;
1049 int len, status;
1050
1051 if (size > 0) {
1052 if (nn->nfsd_serv)
1053 return -EBUSY;
1054 if (size > PATH_MAX || buf[size-1] != '\n')
1055 return -EINVAL;
1056 buf[size-1] = 0;
1057
1058 recdir = mesg;
1059 len = qword_get(&mesg, recdir, size);
1060 if (len <= 0)
1061 return -EINVAL;
1062
1063 status = nfs4_reset_recoverydir(recdir);
1064 if (status)
1065 return status;
1066 }
1067
1068 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
1069 nfs4_recoverydir());
1070}
1071
1072/*
1073 * write_recoverydir - Set or report the pathname of the recovery directory
1074 *
1075 * Input:
1076 * buf: ignored
1077 * size: zero
1078 *
1079 * OR
1080 *
1081 * Input:
1082 * buf: C string containing the pathname
1083 * of the directory on a local file
1084 * system containing permanent NFSv4
1085 * recovery data
1086 * size: non-zero length of C string in @buf
1087 * Output:
1088 * On success: passed-in buffer filled with '\n'-terminated C string
1089 * containing the current recovery pathname setting;
1090 * return code is the size in bytes of the string
1091 * On error: return code is zero or a negative errno value
1092 */
1093static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
1094{
1095 ssize_t rv;
1096 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1097
1098 mutex_lock(&nfsd_mutex);
1099 rv = __write_recoverydir(file, buf, size, nn);
1100 mutex_unlock(&nfsd_mutex);
1101 return rv;
1102}
1103
1104/*
1105 * write_v4_end_grace - release grace period for nfsd's v4.x lock manager
1106 *
1107 * Input:
1108 * buf: ignored
1109 * size: zero
1110 * OR
1111 *
1112 * Input:
1113 * buf: any value
1114 * size: non-zero length of C string in @buf
1115 * Output:
1116 * passed-in buffer filled with "Y" or "N" with a newline
1117 * and NULL-terminated C string. This indicates whether
1118 * the grace period has ended in the current net
1119 * namespace. Return code is the size in bytes of the
1120 * string. Writing a string that starts with 'Y', 'y', or
1121 * '1' to the file will end the grace period for nfsd's v4
1122 * lock manager.
1123 */
1124static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
1125{
1126 struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
1127
1128 if (size > 0) {
1129 switch(buf[0]) {
1130 case 'Y':
1131 case 'y':
1132 case '1':
1133 if (!nn->nfsd_serv)
1134 return -EBUSY;
1135 nfsd4_end_grace(nn);
1136 break;
1137 default:
1138 return -EINVAL;
1139 }
1140 }
1141
1142 return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n",
1143 nn->grace_ended ? 'Y' : 'N');
1144}
1145
1146#endif
1147
1148/*----------------------------------------------------------------------------*/
1149/*
1150 * populating the filesystem.
1151 */
1152
1153/* Basically copying rpc_get_inode. */
1154static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode)
1155{
1156 struct inode *inode = new_inode(sb);
1157 if (!inode)
1158 return NULL;
1159 /* Following advice from simple_fill_super documentation: */
1160 inode->i_ino = iunique(sb, NFSD_MaxReserved);
1161 inode->i_mode = mode;
1162 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
1163 switch (mode & S_IFMT) {
1164 case S_IFDIR:
1165 inode->i_fop = &simple_dir_operations;
1166 inode->i_op = &simple_dir_inode_operations;
1167 inc_nlink(inode);
1168 default:
1169 break;
1170 }
1171 return inode;
1172}
1173
1174static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode, struct nfsdfs_client *ncl)
1175{
1176 struct inode *inode;
1177
1178 inode = nfsd_get_inode(dir->i_sb, mode);
1179 if (!inode)
1180 return -ENOMEM;
1181 if (ncl) {
1182 inode->i_private = ncl;
1183 kref_get(&ncl->cl_ref);
1184 }
1185 d_add(dentry, inode);
1186 inc_nlink(dir);
1187 fsnotify_mkdir(dir, dentry);
1188 return 0;
1189}
1190
1191static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *ncl, char *name)
1192{
1193 struct inode *dir = parent->d_inode;
1194 struct dentry *dentry;
1195 int ret = -ENOMEM;
1196
1197 inode_lock(dir);
1198 dentry = d_alloc_name(parent, name);
1199 if (!dentry)
1200 goto out_err;
1201 ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600, ncl);
1202 if (ret)
1203 goto out_err;
1204out:
1205 inode_unlock(dir);
1206 return dentry;
1207out_err:
1208 dput(dentry);
1209 dentry = ERR_PTR(ret);
1210 goto out;
1211}
1212
1213static void clear_ncl(struct inode *inode)
1214{
1215 struct nfsdfs_client *ncl = inode->i_private;
1216
1217 inode->i_private = NULL;
1218 kref_put(&ncl->cl_ref, ncl->cl_release);
1219}
1220
1221static struct nfsdfs_client *__get_nfsdfs_client(struct inode *inode)
1222{
1223 struct nfsdfs_client *nc = inode->i_private;
1224
1225 if (nc)
1226 kref_get(&nc->cl_ref);
1227 return nc;
1228}
1229
1230struct nfsdfs_client *get_nfsdfs_client(struct inode *inode)
1231{
1232 struct nfsdfs_client *nc;
1233
1234 inode_lock_shared(inode);
1235 nc = __get_nfsdfs_client(inode);
1236 inode_unlock_shared(inode);
1237 return nc;
1238}
1239/* from __rpc_unlink */
1240static void nfsdfs_remove_file(struct inode *dir, struct dentry *dentry)
1241{
1242 int ret;
1243
1244 clear_ncl(d_inode(dentry));
1245 dget(dentry);
1246 ret = simple_unlink(dir, dentry);
1247 d_delete(dentry);
1248 dput(dentry);
1249 WARN_ON_ONCE(ret);
1250}
1251
1252static void nfsdfs_remove_files(struct dentry *root)
1253{
1254 struct dentry *dentry, *tmp;
1255
1256 list_for_each_entry_safe(dentry, tmp, &root->d_subdirs, d_child) {
1257 if (!simple_positive(dentry)) {
1258 WARN_ON_ONCE(1); /* I think this can't happen? */
1259 continue;
1260 }
1261 nfsdfs_remove_file(d_inode(root), dentry);
1262 }
1263}
1264
1265/* XXX: cut'n'paste from simple_fill_super; figure out if we could share
1266 * code instead. */
1267static int nfsdfs_create_files(struct dentry *root,
1268 const struct tree_descr *files)
1269{
1270 struct inode *dir = d_inode(root);
1271 struct inode *inode;
1272 struct dentry *dentry;
1273 int i;
1274
1275 inode_lock(dir);
1276 for (i = 0; files->name && files->name[0]; i++, files++) {
1277 if (!files->name)
1278 continue;
1279 dentry = d_alloc_name(root, files->name);
1280 if (!dentry)
1281 goto out;
1282 inode = nfsd_get_inode(d_inode(root)->i_sb,
1283 S_IFREG | files->mode);
1284 if (!inode) {
1285 dput(dentry);
1286 goto out;
1287 }
1288 inode->i_fop = files->ops;
1289 inode->i_private = __get_nfsdfs_client(dir);
1290 d_add(dentry, inode);
1291 fsnotify_create(dir, dentry);
1292 }
1293 inode_unlock(dir);
1294 return 0;
1295out:
1296 nfsdfs_remove_files(root);
1297 inode_unlock(dir);
1298 return -ENOMEM;
1299}
1300
1301/* on success, returns positive number unique to that client. */
1302struct dentry *nfsd_client_mkdir(struct nfsd_net *nn,
1303 struct nfsdfs_client *ncl, u32 id,
1304 const struct tree_descr *files)
1305{
1306 struct dentry *dentry;
1307 char name[11];
1308 int ret;
1309
1310 sprintf(name, "%u", id);
1311
1312 dentry = nfsd_mkdir(nn->nfsd_client_dir, ncl, name);
1313 if (IS_ERR(dentry)) /* XXX: tossing errors? */
1314 return NULL;
1315 ret = nfsdfs_create_files(dentry, files);
1316 if (ret) {
1317 nfsd_client_rmdir(dentry);
1318 return NULL;
1319 }
1320 return dentry;
1321}
1322
1323/* Taken from __rpc_rmdir: */
1324void nfsd_client_rmdir(struct dentry *dentry)
1325{
1326 struct inode *dir = d_inode(dentry->d_parent);
1327 struct inode *inode = d_inode(dentry);
1328 int ret;
1329
1330 inode_lock(dir);
1331 nfsdfs_remove_files(dentry);
1332 clear_ncl(inode);
1333 dget(dentry);
1334 ret = simple_rmdir(dir, dentry);
1335 WARN_ON_ONCE(ret);
1336 fsnotify_rmdir(dir, dentry);
1337 d_delete(dentry);
1338 dput(dentry);
1339 inode_unlock(dir);
1340}
1341
1342static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
1343{
1344 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
1345 nfsd_net_id);
1346 struct dentry *dentry;
1347 int ret;
1348
1349 static const struct tree_descr nfsd_files[] = {
1350 [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
1351 [NFSD_Export_features] = {"export_features",
1352 &export_features_operations, S_IRUGO},
1353 [NFSD_FO_UnlockIP] = {"unlock_ip",
1354 &transaction_ops, S_IWUSR|S_IRUSR},
1355 [NFSD_FO_UnlockFS] = {"unlock_filesystem",
1356 &transaction_ops, S_IWUSR|S_IRUSR},
1357 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
1358 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
1359 [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
1360 [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
1361 [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", &reply_cache_stats_operations, S_IRUGO},
1362 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
1363 [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
1364 [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
1365 [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO},
1366#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
1367 [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
1368#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
1369#ifdef CONFIG_NFSD_V4
1370 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
1371 [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
1372 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
1373 [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
1374#endif
1375 /* last one */ {""}
1376 };
1377
1378 ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
1379 if (ret)
1380 return ret;
1381 dentry = nfsd_mkdir(sb->s_root, NULL, "clients");
1382 if (IS_ERR(dentry))
1383 return PTR_ERR(dentry);
1384 nn->nfsd_client_dir = dentry;
1385 return 0;
1386}
1387
1388static int nfsd_fs_get_tree(struct fs_context *fc)
1389{
1390 return get_tree_keyed(fc, nfsd_fill_super, get_net(fc->net_ns));
1391}
1392
1393static void nfsd_fs_free_fc(struct fs_context *fc)
1394{
1395 if (fc->s_fs_info)
1396 put_net(fc->s_fs_info);
1397}
1398
1399static const struct fs_context_operations nfsd_fs_context_ops = {
1400 .free = nfsd_fs_free_fc,
1401 .get_tree = nfsd_fs_get_tree,
1402};
1403
1404static int nfsd_init_fs_context(struct fs_context *fc)
1405{
1406 put_user_ns(fc->user_ns);
1407 fc->user_ns = get_user_ns(fc->net_ns->user_ns);
1408 fc->ops = &nfsd_fs_context_ops;
1409 return 0;
1410}
1411
1412static void nfsd_umount(struct super_block *sb)
1413{
1414 struct net *net = sb->s_fs_info;
1415
1416 kill_litter_super(sb);
1417 put_net(net);
1418}
1419
1420static struct file_system_type nfsd_fs_type = {
1421 .owner = THIS_MODULE,
1422 .name = "nfsd",
1423 .init_fs_context = nfsd_init_fs_context,
1424 .kill_sb = nfsd_umount,
1425};
1426MODULE_ALIAS_FS("nfsd");
1427
1428int get_nfsdfs(struct net *net)
1429{
1430 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1431 struct vfsmount *mnt;
1432
1433 mnt = vfs_kern_mount(&nfsd_fs_type, SB_KERNMOUNT, "nfsd", NULL);
1434 if (IS_ERR(mnt))
1435 return PTR_ERR(mnt);
1436 nn->nfsd_mnt = mnt;
1437 return 0;
1438}
1439
1440#ifdef CONFIG_PROC_FS
1441static int create_proc_exports_entry(void)
1442{
1443 struct proc_dir_entry *entry;
1444
1445 entry = proc_mkdir("fs/nfs", NULL);
1446 if (!entry)
1447 return -ENOMEM;
1448 entry = proc_create("exports", 0, entry, &exports_proc_ops);
1449 if (!entry) {
1450 remove_proc_entry("fs/nfs", NULL);
1451 return -ENOMEM;
1452 }
1453 return 0;
1454}
1455#else /* CONFIG_PROC_FS */
1456static int create_proc_exports_entry(void)
1457{
1458 return 0;
1459}
1460#endif
1461
1462unsigned int nfsd_net_id;
1463
1464static __net_init int nfsd_init_net(struct net *net)
1465{
1466 int retval;
1467 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1468
1469 retval = nfsd_export_init(net);
1470 if (retval)
1471 goto out_export_error;
1472 retval = nfsd_idmap_init(net);
1473 if (retval)
1474 goto out_idmap_error;
1475 nn->nfsd_versions = NULL;
1476 nn->nfsd4_minorversions = NULL;
1477 retval = nfsd_reply_cache_init(nn);
1478 if (retval)
1479 goto out_drc_error;
1480 nn->nfsd4_lease = 90; /* default lease time */
1481 nn->nfsd4_grace = 90;
1482 nn->somebody_reclaimed = false;
1483 nn->track_reclaim_completes = false;
1484 nn->clverifier_counter = prandom_u32();
1485 nn->clientid_base = prandom_u32();
1486 nn->clientid_counter = nn->clientid_base + 1;
1487 nn->s2s_cp_cl_id = nn->clientid_counter++;
1488
1489 atomic_set(&nn->ntf_refcnt, 0);
1490 init_waitqueue_head(&nn->ntf_wq);
1491 seqlock_init(&nn->boot_lock);
1492
1493 return 0;
1494
1495out_drc_error:
1496 nfsd_idmap_shutdown(net);
1497out_idmap_error:
1498 nfsd_export_shutdown(net);
1499out_export_error:
1500 return retval;
1501}
1502
1503static __net_exit void nfsd_exit_net(struct net *net)
1504{
1505 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1506
1507 nfsd_reply_cache_shutdown(nn);
1508 nfsd_idmap_shutdown(net);
1509 nfsd_export_shutdown(net);
1510 nfsd_netns_free_versions(net_generic(net, nfsd_net_id));
1511}
1512
1513static struct pernet_operations nfsd_net_ops = {
1514 .init = nfsd_init_net,
1515 .exit = nfsd_exit_net,
1516 .id = &nfsd_net_id,
1517 .size = sizeof(struct nfsd_net),
1518};
1519
1520static int __init init_nfsd(void)
1521{
1522 int retval;
1523 printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
1524
1525 retval = register_pernet_subsys(&nfsd_net_ops);
1526 if (retval < 0)
1527 return retval;
1528 retval = register_cld_notifier();
1529 if (retval)
1530 goto out_unregister_pernet;
1531 retval = nfsd4_init_slabs();
1532 if (retval)
1533 goto out_unregister_notifier;
1534 retval = nfsd4_init_pnfs();
1535 if (retval)
1536 goto out_free_slabs;
1537 nfsd_fault_inject_init(); /* nfsd fault injection controls */
1538 nfsd_stat_init(); /* Statistics */
1539 retval = nfsd_drc_slab_create();
1540 if (retval)
1541 goto out_free_stat;
1542 nfsd_lockd_init(); /* lockd->nfsd callbacks */
1543 retval = create_proc_exports_entry();
1544 if (retval)
1545 goto out_free_lockd;
1546 retval = register_filesystem(&nfsd_fs_type);
1547 if (retval)
1548 goto out_free_all;
1549 return 0;
1550out_free_all:
1551 remove_proc_entry("fs/nfs/exports", NULL);
1552 remove_proc_entry("fs/nfs", NULL);
1553out_free_lockd:
1554 nfsd_lockd_shutdown();
1555 nfsd_drc_slab_free();
1556out_free_stat:
1557 nfsd_stat_shutdown();
1558 nfsd_fault_inject_cleanup();
1559 nfsd4_exit_pnfs();
1560out_free_slabs:
1561 nfsd4_free_slabs();
1562out_unregister_notifier:
1563 unregister_cld_notifier();
1564out_unregister_pernet:
1565 unregister_pernet_subsys(&nfsd_net_ops);
1566 return retval;
1567}
1568
1569static void __exit exit_nfsd(void)
1570{
1571 nfsd_drc_slab_free();
1572 remove_proc_entry("fs/nfs/exports", NULL);
1573 remove_proc_entry("fs/nfs", NULL);
1574 nfsd_stat_shutdown();
1575 nfsd_lockd_shutdown();
1576 nfsd4_free_slabs();
1577 nfsd4_exit_pnfs();
1578 nfsd_fault_inject_cleanup();
1579 unregister_filesystem(&nfsd_fs_type);
1580 unregister_cld_notifier();
1581 unregister_pernet_subsys(&nfsd_net_ops);
1582}
1583
1584MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1585MODULE_LICENSE("GPL");
1586module_init(init_nfsd)
1587module_exit(exit_nfsd)